Free guide

VA Claim Resource Pack

Welcome — here is your free VA Claim Resource Pack. Below is a plain-English guide to how a medical nexus opinion works, what a treating clinician must provide, and practical tips for building a stronger VA disability claim. These are educational self-help resources — not fill-in medical templates and not documents we prepare or file for you.

How to use this guide

This pack explains the medical-nexus piece of a claim so you can have an informed conversation with a qualified clinician (your treating doctor or an accredited independent medical-opinion physician). A nexus opinion is individualized medical evidence that, under 38 CFR §3.159, only a licensed clinician who has reviewed your records can write and sign — it is not something you, or any AI tool, fill in and hand over. This is not medical or legal advice and not a guarantee of any outcome.

How a medical nexus opinion works

A nexus letter is a clinician's written medical opinion linking a current diagnosis to an in-service event, using the VA's “at least as likely as not” standard. Below is what that opinion needs to establish for a few common conditions — so you know what records to gather and what to ask your treating clinician or an independent medical-opinion physician. Under 38 CFR §3.159, the medical opinion itself must come from a qualified clinician; you cannot supply it yourself.

PTSD

What a nexus opinion looks at for service-connected post-traumatic stress disorder tied to an in-service stressor.

A PTSD nexus opinion generally addresses three things: 1. The in-service stressor — the event during service the claim is based on (combat, military sexual trauma, an accident, and so on), supported by your records or a credible statement. 2. A current diagnosis — a PTSD diagnosis from a qualified clinician. 3. The medical link — the clinician's own opinion, in their words, on whether your PTSD is at least as likely as not related to that stressor, with their clinical reasoning. Only the reviewing clinician can provide parts 2 and 3. Your role is to gather the records and ask a qualified clinician to evaluate the connection and, if they agree, write and sign the opinion.

Sleep apnea (often secondary to PTSD)

What a secondary-nexus opinion looks at for obstructive sleep apnea claimed as secondary to a service-connected condition such as PTSD.

Sleep apnea is often claimed as SECONDARY to an already service-connected condition, so a secondary-nexus opinion generally addresses: 1. The service-connected condition — for example, PTSD already rated by the VA. 2. A current diagnosis — obstructive sleep apnea confirmed by a sleep study. 3. The medical link — the clinician's opinion, with reasoning, on whether the service-connected condition at least as likely as not caused or aggravated the sleep apnea. The secondary medical link is a clinical judgment only a qualified clinician can make and sign. Your role is to bring the sleep study and your rating decision to that conversation.

Tinnitus

What a nexus opinion looks at for tinnitus linked to in-service noise exposure.

A tinnitus nexus opinion generally addresses: 1. The in-service noise exposure — for example artillery, aircraft, or weapons fire, with the dates and setting, supported by your records or a statement. 2. A current diagnosis — tinnitus, typically noted by an audiologist. 3. The medical link — the clinician's opinion, with reasoning, on whether your tinnitus is at least as likely as not related to that in-service noise exposure. The opinion itself must be written and signed by the qualified clinician. Your role is to document the noise exposure and ask a clinician to weigh in.

Other conditions

The same three-part framework a clinician applies to any other condition.

For any condition, a clinician's nexus opinion follows the same three-part framework: 1. The in-service event, injury, or exposure the claim is based on. 2. A current diagnosis of the claimed condition from a qualified clinician. 3. The medical link — the clinician's opinion, with reasoning, on whether the condition is at least as likely as not related to service. Use this framework to organize your records and questions. The medical opinion in part 3 must come from, and be signed by, a qualified clinician who has reviewed your records — not from you or an AI tool.

Claim-preparation tips

A few practical steps that tend to make a self-prepared claim stronger:

Gather your evidence first: your DD-214, service treatment records, and any current medical records that show a diagnosis and ongoing treatment.
Connect the dots: for each condition, be able to show a current diagnosis, an in-service event or exposure, and a medical link between the two.
Look for secondary conditions: a service-connected condition can cause or worsen others (for example, sleep apnea or depression secondary to PTSD).
Ask a qualified clinician for the nexus opinion: the medical link must be written and signed by a licensed clinician who has reviewed your records — it is not something you draft yourself, and an unsigned or AI-generated letter is not competent medical evidence.
Consider free help: a VA-accredited VSO can prepare and file your claim at no cost. Verify accreditation before you trust anyone with your claim.

Keep going — free tools

Use our free, no-login tools to estimate your combined rating and see what to do next.

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Important: a nexus opinion only counts as competent medical evidence when a qualified clinician who has reviewed your records writes and signs it (38 CFR §3.159). This pack is educational — it explains what such an opinion involves so you can talk to your clinician. It is not a fill-in template, and an unsigned, AI-generated nexus letter is not competent evidence and can actively hurt your claim.

VA Disability Pro is an independent, self-help technology platform and is not affiliated with or endorsed by the U.S. Department of Veterans Affairs. We are not a law firm or accredited representative, we do not submit anything to the VA on your behalf, and nothing here is legal or medical advice. This pack is general education, not individualized medical templates or completed documents. All outcomes are decided by the VA; we do not guarantee any rating, payment, or approval.